CN1327302A - Thin travelling wave supersonic motor - Google Patents

Abstract

The thin traveling wave supersonic motor has a stator comprising piezoelectric ceramic sheet adhered onto thin circular metal ring and a rotor comprising two semi-circular metal sheets inside the stator. The rotor contacts with the inner side of the stator via the spring installed inside the two semi-circular metal sheets. Inside the stator ring and in the circumferential direction, there are gullets. The supersonic motor has the advantages of simple structure, high thickness, good control performance, etc. and is especially suitable for the driving and control of thin industrial product.

Description

Thin travelling wave supersonic motor

Technical field

Involved in the present invention is the ultrasound electric machine that utilizes ultrasonic vibration in piezoelectric effect and the stator plane.

Background technology

Existing travelling wave supersonic motor, its structure are complicated, are difficult to do very thinly, therefore, can not be applicable to the driving and the control of slimming industrial products.

Summary of the invention

A kind of simple in structure, thin thickness, cost is low, the thin travelling wave supersonic motor that controllability is good, its formation is, placed in the thin metal annulus by piezoelectric ceramic piece and to form stator, the rotor that two semicircle sheet metals are formed places in the track ring, and by placing two springs in the semicircle sheet metal to contact with the track ring medial surface with certain precompression.The stator inboard has teeth groove.This thin travelling wave supersonic motor compared with prior art, have simple in structure, thin thickness, advantage such as less than 10mm, cost is low, and controllability is good is particularly suitable for that the slimming industrial products drive and control.

Description of drawings

Fig. 1, thin travelling wave supersonic motor structural representation.

The teeth groove schematic diagram of Fig. 2, track ring medial surface.

Fig. 3, piezoelectric ceramic piece area polarizing form and 2 phase voltage signals input connected mode schematic diagram.

Fig. 4, in the stator plane (3,1) mode.

Label title among Fig. 1: 1-thin metal annulus, 2-piezoelectric ceramic piece, 3,4-half

The circular metal thin plate, the 5-spring.

Embodiment

By shown in Figure 1, stator is by thin metal annulus 1 and piezoelectric ceramic 2 bonding forming, and the track ring medial surface has equally distributed teeth groove, as shown in Figure 2.Its objective is in order to increase the amplitude of stator, also make the abrasive dust between stator and the rotor to discharge smoothly simultaneously.Why at track ring medial surface tooth punching groove, be because it utilizes two standing waves (differing 90 °) vibration on (perpendicular to the plane) outside the plane to form capable ripple unlike traditional travelling wave supersonic motor, but utilize two standing waves (differing 90 °) on plane to form capable ripple.Place the rotor in the track ring to be connected to form by the spring 5 in the middle of placing by two semicircle sheet metals 3 and 4, spring provides the precompression between stator and the rotor, regulates precompression by the deformation extent that changes spring.

Adopt as shown in Figure 3 piezoelectric ceramic area polarizing form and the input connected mode of 2 phase voltage signals, can guarantee to inspire the needed mode of stator.

Shown in Figure 4 is (3,1) mode of flexural vibration standing wave in this stator plane, under this model frequency, adds on stator that to differ be 90 ° two-phase voltage signal, can form capable ripple (rotation mode) on the track ring medial surface.Cause stator inner periphery particle to produce elliptic motion thus, and then make rotor rotation.

So-called (3,1) mode of flexural vibration is meant that the circumferential distortion in the stator plane has three ripples, and radial deformation has only a node.

Claims (2)

1, a kind of thin travelling wave supersonic motor, it is characterized in that, be adhesive on the thin metal annulus by piezoelectric ceramic piece and form stator, the rotor of two semicircle sheet metal compositions places in the track ring, and by placing two precompressions that spring produced in the semicircle sheet metal to contact with the track ring medial surface.

2, thin travelling wave supersonic motor according to claim 1 is characterized in that, the track ring medial surface along the circumferential direction has equally distributed teeth groove.

Images